File:Line of sight to Plynlimon - geograph.org.uk - 963435.jpg
From Wikimedia Commons, the free media repository
Jump to navigation
Jump to search
Line_of_sight_to_Plynlimon_-_geograph.org.uk_-_963435.jpg (640 × 480 pixels, file size: 206 KB, MIME type: image/jpeg)
File information
Structured data
Captions
Summary[edit]
DescriptionLine of sight to Plynlimon - geograph.org.uk - 963435.jpg |
English: Line of sight to Plynlimon A 'surveyors eye view' from the secondary trig point at Banc y Garn, looking towards the primary triangulation station on Plynlimon which is some 5½ miles away.
When carrying out triangulation work, many observations were made at night with a light illuminating the target station. From 1957, the micro-wave radio distance measuring "Tellurometer" was introduced for recording distances between stations. At this location, the surrounding forestry doesn't quite obscure the view of Plynlimon but it was often the case that no line of sight was available from ground stations because of the growth of forestry or because of other obstructions. In this situation, portable steel towers were constructed over the ground station. Observations from towers had their own problems. The towers flexed in even moderate winds so observations could not be carried out in windy conditions. In hot weather, the steel expanded and this could affect the observed results so the work was done as quickly as possible to minimise errors. |
Date | |
Source | From geograph.org.uk |
Author | OLU |
Camera location | 52° 26′ 32″ N, 3° 54′ 14″ W | View this and other nearby images on: OpenStreetMap | 52.442260; -3.903900 |
---|
Object location | 52° 26′ 32″ N, 3° 54′ 12″ W | View this and other nearby images on: OpenStreetMap | 52.442360; -3.903400 |
---|
Licensing[edit]
This image was taken from the Geograph project collection. See this photograph's page on the Geograph website for the photographer's contact details. The copyright on this image is owned by OLU and is licensed for reuse under the Creative Commons Attribution-ShareAlike 2.0 license.
|
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: OLU
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 17:12, 22 February 2011 | 640 × 480 (206 KB) | GeographBot (talk | contribs) | == {{int:filedesc}} == {{Information |description={{en|1=Line of sight to Plynlimon A 'surveyors eye view' from the secondary trig point at Banc y Garn, looking towards the primary triangulation station on Plynlimon which is some 5½ miles away. When |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
File usage on other wikis
The following other wikis use this file:
- Usage on en.wikipedia.org
- Usage on sv.wikipedia.org
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | SONY |
---|---|
Camera model | DSC-H1 |
Exposure time | 1/400 sec (0.0025) |
F-number | f/4 |
ISO speed rating | 64 |
Date and time of data generation | 16:52, 13 September 2008 |
Lens focal length | 6 mm |
Orientation | 0 |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Picasa 3.0 |
File change date and time | 16:52, 13 September 2008 |
Y and C positioning | Co-sited |
Exposure Program | Normal program |
Exif version | 2.2 |
Date and time of digitizing | 16:52, 13 September 2008 |
Image compression mode | 8 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
Color space | Uncalibrated |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Unique image ID | b88e9db09b62f55533975bbda2b74bf2 |